Why Did the Girlfriend in My Book Become a Concrete Person?

Lu Zhi received an e-book, and as long as he completed the corresponding tasks, he could change certain plots in the book. But in the process of completing the task, Lu Zhi discovered that the characters in the book all existed, and the woman whose future destiny was frequently changed by Lu Zhi seemed to regard herself as the creator of the world. What should I do? Wait online. It's very urgent!